216371660 has 12 divisors (see below), whose sum is σ = 454380528. Its totient is φ = 86548656.

The previous prime is 216371653. The next prime is 216371689. The reversal of 216371660 is 66173612.

216371660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5409272 + ... + 5409311.

It is an arithmetic number, because the mean of its divisors is an integer number (37865044).

Almost surely, 2^216371660 is an apocalyptic number.

216371660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216371660 is an abundant number, since it is smaller than the sum of its proper divisors (238008868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216371660 is a wasteful number, since it uses less digits than its factorization.

216371660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10818592 (or 10818590 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 216371660 is about 14709.5771523181. The cubic root of 216371660 is about 600.3439324428.

The spelling of 216371660 in words is "two hundred sixteen million, three hundred seventy-one thousand, six hundred sixty".